USGS Volcano Notice - DOI-USGS-AVO-2026-04-12T18:01:52+00:00

Slow lava effusion continues within the Great Sitkin summit crater. Over the past day, seismic data recorded frequent rockfalls from the growing lava dome. Satellite imagery shows typical elevated surface temperatures, but cloud cover obscured web camera views.

The current lava eruption began in July 2021 and, since then, has filled most of the summit crater and advanced into valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data, webcams, and regional infrasound and lightning networks.

Low-level unrest persists at the Atka volcanic complex, marked by ongoing seismic tremor. Satellite data also continues to show elevated surface temperatures at the Korovin crater lake.

The Atka volcanic complex includes several vents, including Korovin Volcano, Mount Kliuchef and Sarichef Volcano. Korovin has been the site of most historical eruptions that typically produce minor amounts of ash and occasional but small lava flows. The Atka volcanic complex is monitored by local seismic and infrasound sensors and webcam, satellite data, and regional lightning detection instruments.

Unrest persists at Shishaldin Volcano, with seismic and infrasound activity remaining elevated over the past day. Satellite data from yesterday afternoon detected a sulfur dioxide gas plume, but satellite and web camera views of the volcano have been mostly obscured by clouds.

Local seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions.